The laws states a locker is legally yours when the facility receives physical payment. So in other words who ever pays the facility first owns the unit whether it be the Tenant or the winning bidder.
This is the one disadvantage of online storage auctions compared to a live auctions where you are right there and can pay for the unit.
As for compensation for travel time we always mention in the confirmation emails to give the facility a call FIRST before you make your way there. Some facilities are by appointment only so they require a phone call. This will help avoid bidders wasting their time travelling to the facility if they themselves are unavailable.
If the tenant comes in and pays their fee after the auction ends the facility or Bid13 will contact you and issue a refund for your buyers fee.
If you have any other questions or concerns you can address them to support staff at firstname.lastname@example.org
All the Best Kman